static internal GIFPrim ExtractGIFPrim(UInt32 LowData)
{
GIFPrim pr = new GIFPrim();
pr.PrimitiveType = (GS_PRIM)GetBit(LowData, 0, 3);
pr.IIP = (GSIIP)GetBit(LowData, 3, 1);
pr.TME = Convert.ToBoolean(GetBit(LowData, 4, 1));
pr.FGE = Convert.ToBoolean(GetBit(LowData, 5, 1));
pr.ABE = Convert.ToBoolean(GetBit(LowData, 6, 1));
pr.AA1 = Convert.ToBoolean(GetBit(LowData, 7, 1));
pr.FST = (GSFST)(GetBit(LowData, 8, 1));
pr.CTXT = (GSCTXT)(GetBit(LowData, 9, 1));
pr.FIX = (GSFIX)(GetBit(LowData, 10, 1));
return pr;
}
static internal GIFPrim ExtractGIFPrim(UInt32 LowData)
{
GIFPrim pr = new GIFPrim();
pr.PrimitiveType = (GS_PRIM)GetBit(LowData, 0, 3);
pr.IIP = (GSIIP)GetBit(LowData, 3, 1);
pr.TME = Convert.ToBoolean(GetBit(LowData, 4, 1));
pr.FGE = Convert.ToBoolean(GetBit(LowData, 5, 1));
pr.ABE = Convert.ToBoolean(GetBit(LowData, 6, 1));
pr.AA1 = Convert.ToBoolean(GetBit(LowData, 7, 1));
pr.FST = (GSFST)(GetBit(LowData, 8, 1));
pr.CTXT = (GSCTXT)(GetBit(LowData, 9, 1));
pr.FIX = (GSFIX)(GetBit(LowData, 10, 1));
return(pr);
}
static internal GIFTag ExtractGifTag(byte[] data,GSTransferPath path)
{
GIFTag t = new GIFTag();
t.size = data.Length;
t.path = path;
t.TAG = BitConverter.ToUInt64(data,0);
t.REGS = BitConverter.ToUInt64(data,8);
t.Q = 1f;
t.nloop = (uint)GetBit(t.TAG,0,15);
t.eop = (uint)GetBit(t.TAG,15,1);
t.pre = (uint)GetBit(t.TAG,46,1);
t.prim = GIFPrim.ExtractGIFPrim((uint)GetBit(t.TAG,47,11));
t.flg = (GIFFLG)GetBit(t.TAG,58,2);
t.nreg = (uint)GetBit(t.TAG,60,4);
if (t.nreg == 0)
{
t.nreg = 16;
}
byte[] registers = new byte[t.nreg];
Unpack[] regsunpack = new Unpack[t.nreg];
t.regs = new List <IGifData>();
for (byte i = 0; i < t.nreg; i++)
{
byte reg = (byte)GetBit(t.REGS,i * 4,4);
registers[i] = reg;
regsunpack[i] = GetUnpack(reg);
}
int p = 16;
switch (t.flg)
{
case GIFFLG.GIF_FLG_PACKED:
for (int j = 0; j < t.nloop; j++)
{
for (int i = 0; i < t.nreg; i++)
{
UInt64 LowData = BitConverter.ToUInt64(data,p);
UInt64 HighData = BitConverter.ToUInt64(data,p + 8);
t.regs.Add(regsunpack[i](t,registers[i],LowData,HighData,true));
p += 16;
}
}
break;
case GIFFLG.GIF_FLG_REGLIST:
for (int j = 0; j < t.nloop; j++)
{
for (int i = 0; i < t.nreg; i++)
{
UInt64 Data = BitConverter.ToUInt64(data,p);
t.regs.Add(regsunpack[i](t,registers[i],Data,0,false));
p += 8;
}
}
break;
case GIFFLG.GIF_FLG_IMAGE:
case GIFFLG.GIF_FLG_IMAGE2:
GifImage image = new GifImage();
image.Data = new byte[t.nloop * 16];
try
{
Array.Copy(data,16,image.Data,0,t.nloop * 16);
}
catch (ArgumentException) { }
t.regs.Add(image);
break;
default:
break;
}
return(t);
}
